Restructuring and Impairment Costs - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Restructuring Cost and Reserve [Line Items] | |||||
| Restructuring charges | $ 5 | $ 9 | $ 33 | $ 42 | |
| Noncash and other adjustments | $ 8 | (2) | 2 | ||
| Adient Aerospace | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Impairment of investment | $ 10 | 10 | |||
| 2026 Restructuring Plan | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Restructuring charges | 33 | ||||
| Noncash and other adjustments | $ 1 | ||||
| 2025 Restructuring Plan | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Restructuring charges | 42 | ||||
| Noncash and other adjustments | $ 4 | ||||
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- Definition Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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